Transmitting stationary antennas for television and broadcasting stations of VHF and UHF frequency bands. Classification. Technical requirements. Test methods
Civil defense. Engineering and technical equipment of civil defense constructions. Exploitation of air purification and regeneration devices of the systems of ventilation. General requirements
Corrosion of metals and alloys. Corrosivity of atmospheres. Methods for the determination of corrosion rate of standard specimens used for the evaluation of corrosivity
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